tests: add new test to validate errno handling in the journal superblock

Add a new regression test f_jnl_errno

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

tests/f_jnl_errno/expect.0

@@ -0,0 +1,48 @@
+
+Filesystem volume name:   <none>
+Last mounted on:          <not available>
+Filesystem magic number:  0xEF53
+Filesystem revision #:    1 (dynamic)
+Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize
+Default mount options:    user_xattr acl
+Filesystem state:         clean
+Errors behavior:          Remount read-only
+Filesystem OS type:       Linux
+Inode count:              2048
+Block count:              8192
+Reserved block count:     409
+Free blocks:              6862
+Free inodes:              2037
+First block:              1
+Block size:               1024
+Fragment size:            1024
+Reserved GDT blocks:      31
+Blocks per group:         8192
+Fragments per group:      8192
+Inodes per group:         2048
+Inode blocks per group:   256
+Flex block group size:    16
+Mount count:              0
+Check interval:           0 (<none>)
+Reserved blocks uid:      0
+Reserved blocks gid:      0
+First inode:              11
+Inode size:	          128
+Journal inode:            8
+Default directory hash:   half_md4
+Journal backup:           inode blocks
+Journal features:         (none)
+Journal size:             1024k
+Journal length:           1024
+Journal sequence:         0x00000005
+Journal start:            0
+
+
+Group 0: (Blocks 1-8191) [ITABLE_ZEROED]
+  Primary superblock at 1, Group descriptors at 2-2
+  Reserved GDT blocks at 3-33
+  Block bitmap at 34 (+33), Inode bitmap at 50 (+49)
+  Inode table at 66-321 (+65)
+  6862 free blocks, 2037 free inodes, 2 directories, 2037 unused inodes
+  Free blocks: 1330-8191
+  Free inodes: 12-2048

tests/f_jnl_errno/expect.1

@@ -0,0 +1,9 @@
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+
+test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
+test_filesys: 11/2048 files (9.1% non-contiguous), 1330/8192 blocks
+Exit status is 1

tests/f_jnl_errno/expect.2

@@ -0,0 +1,7 @@
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_filesys: 11/2048 files (9.1% non-contiguous), 1330/8192 blocks
+Exit status is 0

tests/f_jnl_errno/name

@@ -0,0 +1 @@
+journal s_errno handling

tests/f_jnl_errno/script

@@ -0,0 +1,4 @@
+AFTER_CMD='$DUMPE2FS $TMPFILE 2>&1 | sed -f $cmd_dir/filter_dumpe2fs > $test_name.0.log'
+PASS_ZERO=true
+
+. $cmd_dir/run_e2fsck